hengju vacuum loader for plastic granules Equipment principle
 Vacuum loaders are the simplest version of a ‘resin conveying system’ but they are not an integral part of a central conveying system. Self-contained vacuum loaders are used to transfer pellets, regrind and powders from a single source (usually a Gaylord) to a single destination (usually a blender, drying hopper or machine throat). A pickup lance is inserted into the material source container and a length of flexible hose connects the lance to the loader. The loader is mounted on top of the destination point and a small powerful motor creates a vacuum that sucks the material up through the pickup lance and flexible hose into the body of the loader.
There are loaders designed mainly for pellets and regrind while others are designed specifically for powders. There are hopper mount and machine mount versions and Compressed Air Loaders.
There are conventional vacuum loaders and more recent designs that have features like slanted lids for easy access, clear glass center sections, so operation can be viewed, and flat bottoms that do not protrude down into the container on which they are mounted.vacuum pump, autoloaders, vacuum hoppe feeder | 
163.com